lesson_8_ex_3_17_18

m = []
for i in range(0, len(l1)):
  if (l[i] % 2 == 0) and (l[i] % 3 == 0):
    m.append(l[i])
print m

k = []
#mesoi = []
for i in range(0, len(l1)):
  #mesoi.append( (l1[i] + l1[i+1]) / 2. )
  if i < len(l1) - 1:
    k.extend([l1[i] , l1[i] + l1[i+1]) / 2. ])
  else:
    k.append(l1[i])
print k